摘要
为了了解纳米铂(Pt)对以活性碳纤维(ACF)为载体所负载TiO2的复合材料(TiO2/ACF)光催化降解冷藏环境中乙烯的影响。该文采用真空离子溅射仪制备纳米Pt沉积的TiO2/ACF光催化材料(TiO2/ACF-Pt),在模拟园艺产品冷藏环境中,进行了两种不同溅射方案制备TiO2/ACF-Pt的光催化降解乙烯反应速率影响研究,并利用环境扫描电镜(ESEM)、场发射扫描电镜(FESEM)、X射线光电子能谱仪(XPS)对制备材料进行观察与分析。结果表明:在模拟园艺产品冷藏环境中,TiO2/ACF-Pt光催化降解乙烯的动力学可用表观一级速率方程来描述;ACF表面先溅射沉积Pt,再进行TiO2附着方案,能提高降解乙烯的能力,当溅射时间为60s(Pt/Ti原子浓度比为0.112)时,表观一级速率常数是未溅射Pt的1.16倍;TiO2/ACF-Pt的制备方法,对ACF形貌结构没有破坏,并能得到有利于对微量乙烯的吸附的多孔结构。
In order to investigate the effect of nano-platinum （Pt） on photocatalytic degradation of ethylene in the environment of cold storage by TiO2 anchored on activated carbon fibers （TiO2/ACF）. The TiO2/ACF deposited Pt （TiO2/ACF-Pt） by a vacuum ion sputter in two different sputtering ways were prepared. Effects of TiO2/ACF-Pt prepared in different sputtering ways and time on the photocatalytic degradation rate of ethylene were investigated in the simulated cold storage environment for horticultural products. Environmental Scanning Electron Microscope （ESEM）, Field Scanning Electron Microscope （FESEM） and X-ray Photoelectron Spectroscope （XPS） were used to analyze the prepared TiO2/ACF-Pt. Results showed that the kinetics of photocatalytic degradation of ethylene by TiO2/ACF desoposited Pt in the simulated cold storage environment for horticultural products could be described using the pseudo first-order equation. The prepared TiO2/ACF-Pt, in the process of which Pt was initially deposited on the surface of ACF and then TiO2 was coated, would promote the activity of ethylene decomposing. When ion sputtering time was 60 seconds （Pt/Ti atomic concentration ratio was 0.112）, the apparent rate constant of the reaction of TiO2/ACF-Pt was 1.16 times as much as that of TiO2/ACE The micrographic structure of ACF was not damaged and an excessive porous structure, which was contributive to absorbin~ the diluted ethylene, was obtained bv the way of ion sputtering Pt.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2009年第1期260-264,共5页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家自然科学基金(30571075)
广东省自然科学基金(8151064201000032)
关键词
冷藏
乙烯
二氧化钛
活性碳纤维
纳米粒子
铂
离子溅射
cold storage, ethylene, titanium oxides, activated carbon fibers, nano particles, platinum, ion sputtering
